Magnetic choke for carburetors



Nov. 25, 1941. MALL6Y- v 2,263,849

MAGNETIC CHOKE FOR CARBURETORS Filed March 2, 1940 INVENTOR. MARlON MALLORY ATT RNEY; I

Patented Nov. 25, 1941 UNITED STATES 'ATET orrics MAGNETIC CHOKE FOR CARBURETORS Marion Mallory, Detroit, Mich.

Application March 2, 1940, Serial No. 321,948

14 Claims.

This invention relates to magnetic choke for carburetors.

The object of this invention is to use magnetic power only for maintaining or holding the choke valve in the closed position and close the choke valve manually by opening the carburetor throttle. This eliminates the use of a powerful expensive solenoid or magnet, which so far has not proven to be satisfactory when relied upon to supply all the power to operate the choke. This object is achieved by locating the magnet adjacent to an armature that is connected to the choke valve by a spring or resilient means and connecting a thermostatic switch in series with the winding of the magnet and source of current, so that when the temperature is low, the circuit will be closed, causing the magnet to adhere tightly to the armature that is connected to the choke valve. Then, moving the magnet by mechanical means connected to the throttle, so that when the throttle is opened by the operator, the magnet will be moved to another armature and adhere to the armature, holding the choke on until the temperature rises enough to cause the thermostat to open the circuit and release the choke.

In the drawing:

Fig. 1 is an elevation of the carburetor showing the magnetic choke and the electrical circuit. In this figure the circuit is broken and the choke is not in operation.

Fig. 2 is a view similar to Fig. 1 showing the magnetic choke in operation.

Referring more particularly to the drawing there is shown a carburetor I having an air inlet 2 and a fuel-air mixture outlet 3. The carburetor is provided with a throttle valve 4 fixed on pin 5 which is journalled in the carburetor housing I in the usual manner. A lever 6 is fixed on pin 5.

An elec'trom'agnet I is fixed on lever 8 which is .pivotally supported on the housing I by pin 9.

The lever 8 preferably is made of a non-magnetic i i and the other end connected to the lever it as at I5. An armature I6 is fixed to the carburetor housing as shown.

The magnet l is in circuit with a thermostatic v I Aspring I3 has one end connected to the lever I2 as at switch, generally designated H, by wire I8. The thermostatic switch comprises metal posts I9 and. 20 mounted in the housing 2I by means of insulating blocks 22. Post I9 is in electrical circuit with wire I8 and thermostatic bimetal member 23 which is fixedto the lower end of post I9. Bar 24, which is carried by .posts I9 and 20, is insulated from post I9 but is in electrical circuit with post 26. Bar Mcarries contact 25 and bimetal member .23 carries contact 26. The vehicle battery 21 is placed in circuit with post 20 by wire 28 and switch 29 which preferably is the ignition switch. Thermostatic switch I! is mounted directly on the exhaust manifold 31! by screws 3|.

The operation of the device is as follows: When the ignition is turned on by closing switch 29, if the engine is cold the electromagnet 'I is energized because at this'time the thermostatic switch I1 is closed. At this time the energized magnet I attracts and holds armature M tightly against the right hand end of the core 42 of the magnet, Fig. 1. It should be noted that when the magnet is deenergized the core of the magnet is in contact with armature 4I. Thus the magnet! need merely be sufiiciently strong when energized to retain armature 4| against core 42. Thus magnet 1 can be weaker and will use less current than an arrangement wherein the magnet has to draw the armature to it or vice versa. The operator steps on the starter button to start the en'- gine and at the same time opens the throttle valve 4 either manually or by stepping on the accelerator. As the throttle valve 4 swings to open position, lever 6 swings counter-clockwise, Fig. 1, and strikes lever 8 thereby swinging lever 8 clockwise which brings energized magnet 1 into contact with fixed armature I5. Even though the throttle 4 is closed, the armature I will retain its hold on armatures l6 and 4| until deenergized. As the magnet I swings with lever B it acts "through armature ll to swing lever 40 clockwise to the position shown in Fig. 2. As the lever 40 is swung clockwise it acts through spring I3 and lever I2 to exert a force on air valve I0 tending to keep the same closed. When the lever 40 and magnet I are in non-choking position, as shown in Fig. 1, the point I5, at which the lower end of spring i 3 is connected to lever 30, is concentric with pin II so that spring !3 is not under load. As the lever 48 is swung clockwise, point I5 moves away from pin I I thus loading the spring I3.

When the magnet 1 is in the position shown in Fig. 1, the magnetic pull set up by the energized magnet is not, and need not be, strong enough to draw the magnet into contact with the fixed armature IS. The magnet I need merely exert a sufllcient magnetic pull to retain itself in contact with armature 16 after having been manually swung against the same. Because of this a relatively weaker magnet which utilizes less current can be used than in those instances where the pull of the magnet is required to swing the magnet to the armature or vice versa.

After the engine starts, the air valve H], which is unbalanced, is swung open whenever the vacuum on the manifold side of the air valve is suificiently strong. The air valve l0 even when closed permits the passage of a small amount of air through the carburetor. As the hot exhaust gases passing through the exhaust manifold 30 heat the manifold, the temperature within the housing 2| rises. The thermostatic switch I1 is fabricated so that it will open when a predetermined desired temperature is reached in the housing 2|. If this predetermined temperature within housing 2i should, for example, be 45 F., then when the temperature in housing 2| reaches 45 F. which will, of course, be much less than the temperature within the manifold 30, then the bimetal arm 23 will swing downwardly thereby separating contacts 25 and 26 to break the circuit. Whenever the circuit is broken either by thermostatic switch H or by opening ignition switch 29, the magnet I is deenergized and swings away from armature l6 due to gravity to position shown in Fig. 1, and the pull of spring l3 returns lever 40 to position shown in Fig. 1 wherein the magnetic choke is not functioning to choke the carburetor.

It is understood that the thermostatic switch can be operated by electrical heat, water or engine heat.

When the engine is warm so that the thermostatic switch H is opened, the magnet I is deenergized or dead so that lever 40 will not be affected when throttle lever 6 swings lever 8 as the throttle is opened.

I claim:

1. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, an armature, a support for said electromagnet movable relative to said armature, a source of electrical energy adapted to be placed in circuit with the electromagnet, means connecting said electromagnet and choke valve, and mechanism operatively connecting the throttle and the electromagnet whereby opening of the throttle brings the electromagnet and armature together and when the electromagnet is energized causes the choke valve to choke the carburetor.

2. A magnetic choking arrangement for a carburetor comprising in combination a choke valve,

, tle for bringing the armature and electromagnet together as the throttle is opened whereby when the magnet is energized the choke valve is actuated into choking position.

3. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, a movable support for said electromagnet, connections between the choke valve and the electromagnet, a fixed armature, a source of electrical energy adapted to be placed in circuit with the electromagnet, and mechanism operatively connecting the throttle and support for the electromagnet whereby opening of the throttle moves the electromagnet into contact with the armature and causes the choke valve to choke the carburetor.

4. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, a movable support for said electromagnet, connections between the choke valve and the electromagnet, a fixed armature, a source of electrical energy adapted to be placed in circuit with the electromagnet, mechanism operatively connecting the throttle and support for the electromagnet whereby opening of the throttle moves the electromagnet into contact with the armature and causes the choke valve to choke the carburetor, and a thermostatic switch in the electrical circuit responsive to a predetermined temperature to break the said circuit whereby the choke valve is ineffective to choke the carburetor.

5. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, a movable support for the electromagnet, connections between the choke valve and the electromagnet including an armature normally adjacent the electromagnet when in non-choking position, a fixed armature normally spaced from the electromagnet, a source of electrical energy adapted to be placed in circuit with the electromagnet, and mechanism operatively connecting the throttle and the support for the electromagnet whereby opening of the throttlewhen the magnet is energized causes the movable armature to move with the electromagnet and act through the connections to move the choke valve to choking position and brings the electromagnet and fixed armature together to retain the choke valve in choking position.

6. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, a movable support for the electromagnet, connections between the choke valve and the electromagnet including an armature normally adjacent the electromagnet when in non-choking position, a fixed armature normally spaced from the electromagnet, a source of electrical energy adapted to be placed in circuit with the electromagnet, mechanism operatively connecting the throttle and the support for the electromagnet whereby opening of the throttle when the magnet is energized causes the movable armature to move with the electromagnet and act through the connections to move the choke valve to choking position and brings the electromagnet and fixed armature together to retain the choke valve in choking position,

and a thermostatic switch in the electrical circuit for breaking the circuit and deenergizing the electromagnet at a predetermined temperature whereby the electromagnet and choke valve return to non-choking position.

7. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, a pivoted support for the electromagnet, a pivoted armature adjacent the electromagnet, connections between the pivoted armature and the choke valve, a fixed armature normally spaced from the electromagnet, a source of electrical energy adapted to be placed in circuit with the electromagnet, and

mechanism operatively connecting the throttle and the pivoted support for the electromagnet whereby opening of the throttle when the electromagnet is energized swings the electromagnet and pivoted armature to actuate the choke valve into choking position and swings the electromagnet into contact with the fixed armature to retain the choke valve in choking position.

8. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, a pivoted support for the electromagnet, a pivoted armature adjacent the electromagnet, connections between the pivoted armature and the choke valve, a fixed armature normally spaced from the electromagnet, a source of electrical energy adapted to be placed in circuit with the electromagnet, and a' one way driving connection operatively connecting the throttle and the pivoted support for the electromagnet whereby opening of the throttle when the electromagnet is energized swings the electromagnet and pivoted armature to actuate the choke valve into choking position and swings the electromagnet into contact with the fixed armature to retain the choke valve in choking position, the said electromagnet upon being deenergized automatically returning to its initial non-choking position.

9. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, a throttle, an electromagnet, a pivoted support for the electromagnet, a pivoted armature adjacent the electromagnet, connections between the pivoted armature and the choke valve, a fixed armature normally spaced from the electromag 1 net, a source of electrical energy adapted to be placed in circuit with the electromagnet, and mechanism operatively connecting the throttle and the pivoted support for the electromagnet whereby opening of the throttle when the electromagnet is energized swings the electromagnet and pivoted armature to actuate the choke valve into choking position and swings the electromagnet into contact with the fixed armature to retain the choke valve in choking position, a thermostatic switch in the circuit adapted to break the circuit at a predetermined temperature whereby the electromagnet 1s deenergized and the choke rendered ineffective.

10. A magnetic choking arrangement for a carburetor comprising in combination an unbalanced choke valve, a throttle, an electromagnet, a fixed armature, connections between the choke valve and the electromagnet including a yieldable member, a support for said electromagnet movable relative to said armature, a source of electrical energy adapted to be placed in circuit with the electromagnet, and mechanism operatively connecting the throttle and the electromagnet whereby opening of the throttle brings the electromagnet and armature together and tends to cause the choke valve to choke the carbu eto 11. A magnetic choking arrangement for a carburetor comprising in combination an unbalanced choke valve, a throttle, an electromagnet, a pivoted support for the electromagnet, a pivoted armature normally adjacent the electromagnet, a resilient connection between the choke valve and the pivoted armature, a fixed armature, a source of electrical energy adapted to be placed in circuit with the electromagnet, and a one way driving connection operatively connecting the throttle and support for the electromagnet whereby opening of the throttle swings the electromagnet into contact with the fixed armature and when the electromagnet is energized the pivoted armature loads the resilient connection and tends to cause the choke valve to choke the carburetor.

12. A magnetic choking arrangement for a carburetor comprising in combination an unbalanced choke valve, a throttle, an electromagnet, a pivoted support for the electromagnet, a pivoted armature normally adjacent the electromagnet, a spring between the choke valve and the pivoted armature, a fixed armature, a source of electrical energy adapted to be placed in circuit with the electromagnet, and a one way driving connection operatively connecting the throttle and support for the electromagnet whereby opening of the throttle swings the electromagnet into contact with the fixed armature and when the electromagnet is energized the pivoted armature loads the resilient connection and tends to cause the choke valve to choke the carburetor.

13. A magnetic choking arrangement for a carburetor comprising in combination a choke valve, 2. throttle valve, an electromagnet member, an armature member, a movable support for one of said members and a fixed support for the other of said members, connections between the choke valve and the movable support, a source of electrical energy adapted to be placed in circuit with the electromagnet, and mechanism operatively connecting the throttle valve and movable support whereby opening of the throttle moves the movable support and thereby places the electromagnet in contact with the armature and causes the choke valve to choke the carburetor, the said armature adhering to the electromagnet as long as the electromagnet is energlzed.

14. A magnetic choking arrangement for a carburetor comprising a choke valve, an electromagnet mounted on a pivoted member, a stationary armature, a spring connection between the pivoted member that carries the electromagnet and the choke valve, a member which operates in unison with the throttle valve so that when the throttle valve is opened, the last named member will move the pivoted member carrying the electromagnet to a position where the electromagnet contacts the stationary armature, pulling the choke valve closed by sa d sp MARION MALLORY. 

